#51126 [NEW]: class_exists + namespaces

[richard at rjharrison dot org]

From: richard at rjharrison dot org
Operating system: linux
PHP version: 5.3.1
PHP Bug Type: Unknown/Other Function
Bug description: class_exists + namespaces

Description:
------------
class_exists() is not calling my spl_autoload_register'ed function with a
fully qualified (namespaced) class name.

Because the input to my autoload function is not fully qualified, it
cannot load the class and class_exists return false; however, if I try to
instantiate the class that "does not exist" then the correct, fully
qualified class now passed to the autoloader: it correctly loads the class
and my code works.

Reproduce code:
---------------
// register my autoloader

use Foo\Things;

// This fails: my autoload function is called with $class = 'Things\Car'
if(class_exists('Things\Car')){
echo "class exists!";
}else{
echo "Weird?";
}


// This works: my autoload function is called with $class =
'Foo\Things\Car'
$x = new Things\Car();



Expected result:
----------------
"class exists!"

Actual result:
--------------
"Weird?"
--
Edit bug report at http://bugs.php.net/?id=51126&edit=1
--
Try a snapshot (PHP 5.2): http://bugs.php.net/fix.php?id=51126&r=trysnapshot52
Try a snapshot (PHP 5.3): http://bugs.php.net/fix.php?id=51126&r=trysnapshot53
Try a snapshot (PHP 6.0): http://bugs.php.net/fix.php?id=51126&r=trysnapshot60
Fixed in SVN: http://bugs.php.net/fix.php?id=51126&r=fixed
Fixed in SVN and need be documented: http://bugs.php.net/fix.php?id=51126&r=needdocs
Fixed in release: http://bugs.php.net/fix.php?id=51126&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=51126&r=needtrace
Need Reproduce Script: http://bugs.php.net/fix.php?id=51126&r=needscript
Try newer version: http://bugs.php.net/fix.php?id=51126&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=51126&r=support
Expected behavior: http://bugs.php.net/fix.php?id=51126&r=notwrong
Not enough info: http://bugs.php.net/fix.php?id=51126&r=notenoughinfo
Submitted twice: http://bugs.php.net/fix.php?id=51126&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=51126&r=globals
PHP 4 support discontinued: http://bugs.php.net/fix.php?id=51126&r=php4
Daylight Savings: http://bugs.php.net/fix.php?id=51126&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=51126&r=isapi
Install GNU Sed: http://bugs.php.net/fix.php?id=51126&r=gnused
Floating point limitations: http://bugs.php.net/fix.php?id=51126&r=float
No Zend Extensions: http://bugs.php.net/fix.php?id=51126&r=nozend
MySQL Configuration Error: http://bugs.php.net/fix.php?id=51126&r=mysqlcfg

[richard at rjharrison dot org]

ID: 51126
User updated by: richard at rjharrison dot org
Reported By: richard at rjharrison dot org
Status: Bogus
Bug Type: SPL related
Operating System: linux
PHP Version: 5.3.1
New Comment:

Hi Johannes,

I double-checked the documentation and found no mention that the string
passed to class_exists() must be fully qualified. Perhaps this is a
documentation bug.

It is certainly seems inconsistent/counter-intuitive:-

class_exists('Things\Car'); // FALSE, class does not exist
$car = new Things\Car(); // HUH? Class does exist after all

So PHP is able to figure out there is a "use Foo/Things" namespace in
effect on one line, but not on the other? Lame.


Previous Comments:
------------------------------------------------------------------------

[2010-02-23 18:46:01] ***@php.net

Thank you for taking the time to write to us, but this is not
a bug. Please double-check the documentation available at
http://www.php.net/manual/ and the instructions on how to report
a bug at http://bugs.php.net/how-to-report.php

When used as a string we need the fully qualified name as we don't know
where the parameter is coming from.

------------------------------------------------------------------------

[2010-02-23 18:41:57] richard at rjharrison dot org

Description:
------------
class_exists() is not calling my spl_autoload_register'ed function with
a fully qualified (namespaced) class name.

Because the input to my autoload function is not fully qualified, it
cannot load the class and class_exists return false; however, if I try
to instantiate the class that "does not exist" then the correct, fully
qualified class now passed to the autoloader: it correctly loads the
class and my code works.

Reproduce code:
---------------
// register my autoloader

use Foo\Things;

// This fails: my autoload function is called with $class =
'Things\Car'
if(class_exists('Things\Car')){
echo "class exists!";
}else{
echo "Weird?";
}


// This works: my autoload function is called with $class =
'Foo\Things\Car'
$x = new Things\Car();



Expected result:
----------------
"class exists!"

Actual result:
--------------
"Weird?"


------------------------------------------------------------------------

[j***@php.net]

ID: 51126
Updated by: ***@php.net
Reported By: richard at rjharrison dot org
-Status: Open
+Status: Bogus
-Bug Type: SPL related
+Bug Type: Unknown/Other Function
Operating System: linux
PHP Version: 5.3.1
New Comment:

Thank you for taking the time to write to us, but this is not
a bug. Please double-check the documentation available at
http://www.php.net/manual/ and the instructions on how to report
a bug at http://bugs.php.net/how-to-report.php

When used as a string we need the fully qualified name as we don't know
where the parameter is coming from.


Previous Comments:
------------------------------------------------------------------------

[2010-02-23 18:41:57] richard at rjharrison dot org

Description:
------------
class_exists() is not calling my spl_autoload_register'ed function with
a fully qualified (namespaced) class name.

Because the input to my autoload function is not fully qualified, it
cannot load the class and class_exists return false; however, if I try
to instantiate the class that "does not exist" then the correct, fully
qualified class now passed to the autoloader: it correctly loads the
class and my code works.

Reproduce code:
---------------
// register my autoloader

use Foo\Things;

// This fails: my autoload function is called with $class =
'Things\Car'
if(class_exists('Things\Car')){
echo "class exists!";
}else{
echo "Weird?";
}


// This works: my autoload function is called with $class =
'Foo\Things\Car'
$x = new Things\Car();



Expected result:
----------------
"class exists!"

Actual result:
--------------
"Weird?"


------------------------------------------------------------------------